Glorious images of the Sun, from NASA

July 3, 2014

Who’d have thought of such an image, before we used satellites to look?

NASA SDO images of the Sun

From NASA: Image info: This combination of three wavelengths of light from NASA’s Solar Dynamics Observatory shows one of the multiple jets that led to a series of slow coronal puffs on January 17, 2013. The light has been colorized in red, green and blue. Credit: NASA SDO

NASA’s press release, from June 27, 2014:

A suite of NASA’s Sun-gazing spacecraft have spotted an unusual series of eruptions in which a series of fast puffs forced the slow ejection of a massive burst of solar material from the Sun’s atmosphere. The eruptions took place over a period of three days, starting on Jan. 17, 2013. Nathalia Alzate, a solar scientist at the University of Aberystwyth in Wales, presented findings on what caused the puffs at the 2014 Royal Astronomical Society’s National Astronomy Meeting in Portsmouth, England.

The sun’s outermost atmosphere, the corona, is made of magnetized solar material, called plasma, that has a temperature of millions of degrees and extends millions of miles into space. On January 17, the joint European Space Agency and NASA’s Solar and Heliospheric Observatory, or SOHO, spacecraft observed puffs emanating from the base of the corona and rapidly exploding outwards into interplanetary space. The puffs occurred roughly once every three hours. After about 12 hours, a much larger eruption of material began, apparently eased out by the smaller-scale explosions.

By looking at high-resolution images taken by NASA’s NASA Solar Dynamics Observatory (Little SDO), or SDO, and NASA’s Solar Terrestrial Relations Observatory, or STEREO, over the same time period and in different wavelengths, Alzate and her colleagues could focus on the cause of the puffs and the interaction between the small and large-scale eruptions.

“Looking at the corona in extreme ultraviolet light we see the source of the puffs is a series of energetic jets and related flares,” said Alzate. “The jets are localized, catastrophic releases of energy that spew material out from the sun into space. These rapid changes in the magnetic field cause flares, which release a huge amount of energy in a very short time in the form of super-heated plasma, high-energy radiation and radio bursts. The big, slow structure is reluctant to erupt, and does not begin to smoothly propagate outwards until several jets have occurred.”

Because the events were observed by multiple spacecraft, each viewing the sun from a different perspective, Alzate and her colleagues were able to resolve the three-dimensional configuration of the eruptions. This allowed them to estimate the forces acting on the slow eruption and discuss possible mechanisms for the interaction between the slow and fast phenomena.

“We still need to understand whether there are shock waves, formed by the jets, passing through and driving the slow eruption,” said Alzate. “Or whether magnetic reconfiguration is driving the jets allowing the larger, slow structure to slowly erupt. Thanks to recent advances in observation and in image processing techniques we can throw light on the way jets can lead to small and fast, or large and slow, eruptions from the Sun.”

Van Gogh painted rather unusual images of the Sun and stars; Turner painted perhaps more life-like images.   There are many interesting views of the Sun in art, by Monet, and many, many others.

Vincent van Gogh,

Vincent van Gogh, “Sower with the Setting Sun”

But who conceived of any image like this one from NASA, above?

What private entity could ever do that?  

J. M. W. Turner,

J. M. W. Turner, “Caernarvon Castle,” 1799

Claude Monet,

Claude Monet, “Impression Sunrise”

British biologist J. B. S. Haldane said:

I have no doubt that in reality the future will be vastly more surprising than anything I can imagine. Now my own suspicion is that the Universe is not only queerer than we suppose, but queerer than we can suppose.

♦   Possible Worlds and Other Papers (1927), p. 286

Haldane may as well have added, the universe is not only more beautiful that we imagine, but more beautiful than we can imagine.  Reality trumps fiction yet again.

Return of the Aurora Borealis

August 4, 2010

Aurora Borealis, by Wiciwato (Yahoo Flickr compilation) - July-August 2010

Aurora Borealis, by Wiciwato (Yahoo Flickr compilation) - July-August 2010 - notice the Big Dipper in the photo?

A storm on the Sun last Sunday launched a wave of cosmic particles toward the Earth — the particles whose striking of the upper atmosphere causes ions to glow, creating the Northern Lights.

And so the Northern Lights, the Aurora Borealis, returned to the planet in spectacular fashion this week, after more than a year of relative solar dormancy.  According to the Christian Science Monitor, outstanding displays of the lights may continue through this week.

Yahoo’s Flicker editors put together a collection of photos from Flickr, from which the photo above is taken — there are a lot more spectacular shots there.

Resources, more:

Pictures of the coronal mass ejection from the Sun dazzle, too:

Caption from NASA: On August 1st, almost the entire Earth-facing side of the sun erupted in a tumult of activity. There was a C3-class solar flare, a solar tsunami, multiple filaments of magnetism lifting off the stellar surface, large-scale shaking of the solar corona, radio bursts, a coronal mass ejection and more. This extreme ultraviolet snapshot from the Solar Dynamics Observatory (SDO) shows the sun's northern hemisphere in mid-eruption. Different colors in the image represent different gas temperatures ranging from ~1 to 2 million degrees K. Credit: NASA/SDO

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